METRIBUZIN
| Chemical Identification | |
|---|---|
| CAS # | 21087-64-9 |
| Formula |
C₈H₁₄N₄OS |
| Synonyms |
4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one |
| Physical Properties | |||
|---|---|---|---|
| Physical description | Colorless, crystalline solid. | ||
| Boiling point | Molecular weight | 214.3 | |
| Freezing point/melting point | 257°F | Vapor pressure | 0.0000004 mmHg |
| Flash point | Vapor density | ||
| Specific gravity | 1.31 | Ionization potential | |
| Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
| NFPA health rating | NFPA fire rating | ||
| NFPA reactivity rating | NFPA special instruction | ||
| Vapor hazard ratio (VHR) | |||
| Historical exceedance percentage | |||
| Target organs | |||
| Monitoring Methods Used by OSHA | ||||||
|---|---|---|---|---|---|---|
| Analyte code (IMIS no.) | A175 | |||||
| Sampling group | ||||||
| Sampler/Sampling media | OSHA versatile sampler (OVS-2) - 13 mm XAD-2 tube (270/140 mg) with GFF enclosed [SKC 226-30-16] | |||||
| Sampling time* | ||||||
| Sampling volume (TWA)* | 240 L |
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| Sampling flow rate (TWA)* | 1 L/min |
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| Sampling volume (STEL/Peak/C)* | ||||||
| Sampling flow rate (STEL/Peak/C)* | ||||||
| Analytical method instruments | GC-FPD | |||||
| Method reference | OSHA PV2044 (partially validated) | |||||
| Notes |
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| Special requirements |
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* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
| Wipe Method | |
|---|---|
| Sampler/Sampling media |
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| Bulk Method |
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| On-Site Screening Techniques | ||||||
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| Device | ||||||
| Model/Type | ||||||
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Sampling information (see manufacturer instructions) |
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| Exposure Limits | |||||||
|---|---|---|---|---|---|---|---|
|
OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
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| PEL-TWA |
|
REL-TWA |
5 mg/m³ |
TLV-TWA |
5 mg/m³ [1981] |
PEL-TWA |
5 mg/m³ |
| PEL-STEL |
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REL-STEL |
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TLV-STEL |
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PEL-STEL |
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| PEL-C |
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REL-C |
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TLV-C |
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PEL-C |
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| Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
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Notes:
Not established |
Notes:
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Notes:
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Notes:
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| Health factors: See NIH-NLM PubChem. | IDLH | ||||||
| Carcinogenic classifications: TLV-A4, EPA-D |
Notes:
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
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| Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Metribuzin NIOSH: Pocket Guide to Chemical Hazards - Metribuzin Literature References
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Last Updated Date : 01/05/2021